25
DJM-850-K
5
6
7
8
5
6
7
8
A
B
C
D
E
F
2
Loose connection
/defective parts
MAI
N
Assy
IC201
[Checking the DAC block]
Check for the DA converter (IC201)
signal output.
MASTER: pin 29, pin31, pin 33, pin 35
REC: pin37, pin 39
BOOTH: pin41, pin 43
• If the DAC output signal is normal, the MUTE
circuit is activated. Go to [15].
• If no signal is output from the DAC output,
go to [3].
10.35
W
A
V
EFORMS
3
Loose connection
/defective parts
MAI
N
Assy
IC201 pin
8
, 9, 10, 11
[Checking the DAC block]
Check that a signal is input to the
DA converter.
MASTER: pin10, pin 11
REC: pin 9
BOOTH: pin
8
• If no signal is output, the DSP (IC3201) must
be improperly soldered or defective.
• If a signal is output, go to [4].
10.35
W
A
V
EFORMS
4
Loose connection
/defective parts
MAI
N
Assy
IC201 pin 1
8
[Checking the DAC block]
Check for the AMUTEI signal
(IC201 pin 1
8
).
• If it is L, the R212 or IC201 must be
improperly soldered or defective.
• If it is H, go to [5].
—————
5
Loose connection
/defective parts
MAI
N
Assy
IC201 pin 15
[Checking the DAC block]
Check for the RESET signal at
DA converter.
• If it is H, go to [7].
• If it is L, go to [6].
—————
6
Loose connection
/defective parts
MAI
N
Assy
96k CLK: IC201
pin 6
6M CLK: IC201
pin 7
24M CLK: IC201
pin 14
[Checking the DAC block]
Check for the CLK signal at DA converter.
• If a signal is output, go to [
8
].
• If the CLK signal is output, soldering of the
IC201 or the IC itself is defective.
10.35
W
A
V
EFORMS
(MASTER)
1-4
8
1-49
1-50
1-51
1-52
1-52 1-53 1-54
1-53
1-54
1-49
1-4
8
(REC)
1-4
8
(BOOTH)
1-4
8
[3] AUDIO OUTPUT
[3-1] No signal is output from the MASTER1/MASTER2/REC/BOOTH connectors.
1
Prior
Confirmation
MASTER1 /
MASTER2 /
REC / BOOTH
Identify the connector(s) that do(es) not
output signals.
• If all connectors does output, go to [2].
• If neither MASTER 1 nor 2 connector outputs,
go to [9].
• If only the MASTER 1 connector does not
output, go to [10].
• If only the MASTER 2 connector does not
output, go to [11].
• If only the BOOTH connector does not output,
go to [13].
Operating
instructions
1-42
1-42
2
Loose connection
/defective parts
MAI
N
Assy
IC2402 pin1, pin 2
[Checking the ADC block]
Check for an audio signal at the input
connector of ADC (IC2401).
If no audio signal is input to ADC, a problem in
an analog circuit at a previous stage may be
suspected.
• If no audio signal is input, check for a part
where the signal is interrupted, by observing
the audio signal in the path from the input
connector to the ADC, then check the
soldering status and check for a defective
part in the corresponding part.
• If an audio signal is input, go to [3].
10.35
W
A
V
EFORMS
1-43
1-44
1-44 1-45 1-46
1-45
1-46
1-47
1-47
3
Loose connection
/defective parts
MAI
N
Assy
IC2402 pin 13
[Checking the RESET signal path]
Check for the RESET signal at ADC.
• If the RESET signal level is L, go to 2-2 [5].
• If the RESET signal level is H, go to [4].
—————
4
Loose connection
/defective parts
MAI
N
Assy
LRCK: IC2402 pin 10
BCLK: IC2402 pin 12
MCLK: IC2402 pin 11
[Checking the ADC block]
Check for the CLK signal of ADC.
• If no CLK signal is input, go to 2-2 [6].
• If the CLK signal is input, go to [5].
10.35
W
A
V
EFORMS
5
Loose connection
/defective parts
MAI
N
Assy
IC2402 pin 9
[Checking the ADC block]
Check for the signal output from ADC
output terminal.
• If output signal cannot be confirmed, ADC
may be defective.
Check for the status of soldering and replace it.
• If output signal can be confirmed, DSP
(IC3201) must be improperly soldered or
defective.
10.35
W
A
V
EFORMS
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
